#include<iostream>
#include<string>
#include<cctype>
using namespace std;
int main(){
	string s1;
	getline(cin,s1);
	int i = 0;
for(int i = 0; i < s1.size(); i++){
		if(s1[i]=='a')s1[i]='z';
		else if(s1[i]=='A')s1[i]='Z';
		else if(islower(s1[i]) && s1[i]!='a')s1[i]--;
		else if(isupper(s1[i]) && s1[i]!='A') s1[i]--;
		
	}
	cout << s1;
	return 0;
}
